In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Find the missing number in the series below

13 -21 34 -55 ? -144

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What is both possible and impossible at the same time?

Why is the longest human nose just 11 inches?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

How many triangles can you find in this given picture?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13